Photo-riddle for Bayou City Dwellers: Guess what this is

If you can figure it out, you advance to the next level..... Next question: Where was this picture taken? 

Page down for answer. I'll put some other pics in between. Perhaps as hints. Perhaps to fool you. 

Pull yourself up

No need to crack this one - It's already a half shell (and empty)

And here is the answer: 

Buffalo Bayou waters exiting from the flood control gate at Barker Reservoir after heavy rain. 

Barker Reservoir flow control gate releasing more water than normal amount